Augmented Hoist Cable Cut Algorithm for Snagging Scenarios
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Solution Overview
Problem
Rescue hoist cable systems face hazards due to manual intervention delays in cable cutting during overload conditions, leading to potential helicopter damage and accidents, as pilots have limited reaction time to initiate cable cuts during snagging scenarios.
Innovation Solution
An augmented cable cutting algorithm that continuously monitors dual-redundant clutch-slip and load sensors, automatically initiating a cable cut with a predetermined time window for aural and visual indications, allowing pilot override, and utilizing a cable cut cartridge to execute the cut if no override is made.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual cable cutting is used during overload conditions, then the system structure remains simple, but the reaction time is insufficient leading to potential helicopter damage
Solution Approach 1:
The system performs preliminary monitoring of clutch slip and load conditions continuously, so that when an overload condition occurs, the cable cut can be executed immediately without waiting for manual detection. The algorithm determines clutch slip duration and overload conditions in advance, preparing the system for rapid automated response.
Solution Approach 2:
The system uses feedback from dual-redundant clutch sensors and load sensors to continuously monitor the hoist system state. When sensors detect clutch slip exceeding a threshold or overload conditions, this feedback triggers the automated cable cut sequence, eliminating the need for manual intervention and reducing reaction time.
2Loss of time
If automated cable cutting is implemented, then the reaction time is reduced, but the device complexity increases due to additional sensors and control systems
Solution Approach 1:
The system merges the functions of clutch monitoring and load monitoring into a single integrated control algorithm. The same controller that manages hoist operations also processes sensor data and executes cable cut commands, consolidating control functions rather than adding separate dedicated systems.
Solution Approach 2:
The hoist system monitors its own operational parameters (clutch slip and load conditions) using existing sensors, and automatically executes cable cut decisions based on pre-programmed algorithms. The system serves itself by detecting anomalies and initiating protective actions without external intervention.
3Reliability
If automated cable cut is initiated without delay, then the safety is improved, but the operator loses control over the decision-making process
Solution Approach 1:
The system provides preliminary aural and visual warnings before executing the cable cut, giving the operator advance notice and an opportunity to override the automated decision. This preliminary alert phase maintains operator control while still preparing for rapid automated action if needed.
Solution Approach 2:
The system provides continuous feedback to the operator through aural and visual warnings when cable cut conditions are detected. This feedback loop allows the operator to monitor the automated system's decision-making process and intervene if desired, maintaining human oversight while benefiting from automated speed.
Data Source
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AI summary
Systems and methods for operating a hoist and hook assembly may method comprising determining a clutch slip via a clutch sensor (204, 206), determining an overload via a load sensor (212), and cutting a cable (106) coupled to the hoist and hook assembly in response to the clutch slip determination and the overload determination.